Home | | Human Nervous System and Sensory Organs | Efferent and Afferent Fibers - Autonomic Periphery

Chapter: Human Nervous System and Sensory Organs - Autonomic Nervous System

Efferent and Afferent Fibers - Autonomic Periphery

The preganglionic fibers are myelinated, while the postganglionic fibers are unmyelinated.

Autonomic Periphery


Efferent Fibers

The preganglionic fibers are myelinated, while the postganglionic fibers are unmyelinated. The unmyelinated fibers are sur-rounded by the cytoplasm of Schwann cells, and a single Schwann cell envelopes several axons.


Afferent Fibers 

The viscerosensory fibers are myelinated. They are regarded as being neither sympa-thetic nor parasympathetic in nature. In general, they accompany the sympathetic nerves and enter the spinal cord through the posterior roots. The fibers from the heart run through the upper thoracic roots, those from the stomach, liver, and gallblad-der run through the middle thoracic roots, and those from the colon and appendix run through the lower thoracic roots. The re-spective dermatomes of these roots corre-spond roughly to the various Head’s zones.

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail
Human Nervous System and Sensory Organs - Autonomic Nervous System : Efferent and Afferent Fibers - Autonomic Periphery |


Privacy Policy, Terms and Conditions, DMCA Policy and Compliant

Copyright © 2018-2023 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.